Mind you it's the same tactic that's gotten nearly every (or is it every) team that I've seen promote to the ABBL, since entering this league.
Not every. I would have to check a bit more carefully but I don't think I really did it. Season 17 when I won my core at the start of the season was:
Guards: Mu, Oliver, Vallo, Barton and Kent.
SF: Rober
PF: big hole a collection of bad Cs playing PF.
C: Sherwin.
The only big change for the whole season was I sold Kent (didn't need 5 good guards) and bought Juan Carlos Gamboa so I finally had a PF. I admit it was late in the season and he only played three regular season games.
Season 18 I tanked the season so sold off Juan Carlos Gamboa, Rober, Mu and most of my team so that I was down to the salary floor. Late that tanking season I made the two next big additions picking up Sperbert and Lawrance.
Season 19 I won division II again. At the start of that season my core was:
Guards: Oliver, Vallo, Barton, Kumar and Hołówka.
SF: Sperbert
PF: Lawrance
C: Sherwin
During the season I made two changes, I basically traded Hołówka ($50k SG) for Lluís Cardil ($60k SG who had better matched skills to my teams needs and strategies). Then I admit right at the end I did rent Ander Oriol a $90k C (cost me $300k to buy) for the playoffs just to give me some depth, so that an injury to a key wouldn't see me spending another season in division II. At the time his quote was something like that he was insurance. I was 20/21 at the time and felt that unless I had an injury I should win but I just wanted that extra buffer so I could survive an injury.
So I respectfully claim not every.